SOLUTION 
We have been given the equation of the decay as 

So we are looking for the time 
Plugging the values into the equation, we have 

Taking Ln of both sides, we have 

Hence the answer is 4308 to the nearest year 
 
        
             
        
        
        
C and D are the same, so its between A and B, which concludes your answer should be B
        
                    
             
        
        
        
Answer:
x=5/2, x=-4/3
Step-by-step explanation:
 
        
             
        
        
        
Answer:
c=2r
divide both sides by 2
c/2=r
if you forgot the pi
c=2pir
divide by 2pi
c/(2pi)=r
Step-by-step explanation: